Improvement in scale-beams



T. TEBOw.

Scale-Beam.

Patented March 30,1875.

THE GRAPHIC CO.PMOTD.-LITH.39 8f4-l PARK PLAGEJLY.

' 1 NITED STATES PATENT FFICE.

THEODORE TEBOW, OF LEXINGTON, KENTUCKY.

IMPROVEMENT IN SCALE-BEAMS.

Specification forming part of Letters Patent No. 16l,576, dated March 30, 1875; application iiled January 22, 1875.

" all whom 'it may concern:

Beit known that I, THnoDoRE TEBOW, of

l exington, Fayette county, State of Kenucky, have invented an Improvement in Scale-Beams, of which the following is a specilcation:

My invention is designed as an improvenent upon the scale-beam with rotating drum I aving a spiral line of graduations, for which n application for patent was iiled by me Deember 5,1874, and consists in such an arangement of the spiral drum and the screw hich moves thc traversing weight, and peuliar construction of those parts and of the upporting-frame, that the screw is located within the drum, the latter having a spiral slot, through which the susliending-rod ofthe weight passes, and also the arm of the indicating-linger, which connects with the graduations on the edge of the spiral slot.

Figure l is a perspective view of my improved scale-beam. Fig. 2 is a perspective view of the screw and box which support the weight and indicator. Fig. 3 is a cross-section ofthe frame, screw-spindle, and supporting-rollers at the point X. Fig. 4L is a crosssection of the frame, screw-spindle, and supporting-rollers at the point Y. Figs. 5 and 6 are sections illustrating a modification in form 0f drum.

The frame A is provided with the customary V-shaped fulcrums a. u. for the suspending-yoke B and weight-yoke C, which sustain the weight or load to be indicated. This frame A has an aperture throughout its whole length for the passage of the screw-spindle D, which is supported in the frame, at X, on idlers or friction-rollers E, and is held from moving upward in the frameat Y by frictionrollers F in the circular projection G of the frame A. A sliding adjustable weight, H, upon the beam suffices to balance the beam. The screw-spindle has rigidly attached to its ends milled heads or hand-wheels I I. by which the operator is enabled to rotate it for the adjustment of the balance-weight K with its indicator'. The graduated drum L is also secured to the screw at both ends, and rotates with it. The drum has a spiral slot, l, cut in it, through which the hook-rod 7s ofthe balance-Weight K extends, and also the arm 'm of the registering or indicating nger M, both of these being attached to the screwthreaded box N, which is kept from rotating by the gravitating action of the balanceweight K.

The spiral slot is ot' the same pitch, necessarily, as the screw-thread on the spindle D, so that the arm m and rod lo may travel freely in the slot; and it will be seen that, as the weight K is adjusted to balance the load upon the beam, the indicating-linger M will point to the graduations on the edge of the slot, and thus indicate the weight of the load.

The screw-spindle and its drum are preserved 'rom end movement by the face Z ot' the drum, which is in contact with that end of the frame A, and by the inner face ot' handwheel I, which is in contact with the other end of the frame A.

For the reason that the screw-spindle passes entirely through the frame A to ailord length of bearing, I have to employ a different form of bails or yokes, B C, from those ordinarily used on scale-beams. I have provided yokes, as shown, with double jaws c c b b', which straddle the frame sides, and connect on each side of each jaw with V-shaped fulcrums ct a. The provision of these double jaws and eight fulcrums is designed to give lightness to each fulcrum andl sensibility to the movement ot' the. beam.

The drum L may be a thin shell, having thin ends to connect with the screw-shaft D', the arm m and rod 7c passing through the thin outer shell in groove l, as indicated in Fig. l; or it may be more solid, as indicated in Figs. 5 and 6, having only a central aperture large enough for the passage of box N and the spiral slot l.

I claiml. The combination of frame A, screw-spinn die D, box N, weight K, indicator M, and spirally-slotted drum L l, the parts being connected and the whole operating substantially in the manner and for the purpose speciiied.

2. In combination with the hollow frame A, the double-jawed yokes B O, and fulcrums a a u; a a a a af, constructed and operating substantially as and for the purpose speciiied.

In testimony of which invention I hereunto set my hand.

THEODORE TEBOW.

Witnesses:

F. MILLWARD, J. L. WARLPMANN. 

